In which of the following scenarios is the greatest amount of work accomplished?
a crane lifts a boulder weighing 300 n to a height of 4.0 meters.
a crane lifts a boulder weighing 400 n to a height of 2.0 meters.
a crane lifts a boulder weighing 200 n to a height of 8.0 meters.
a crane lifts a boulder weighing 250 n to a height of 6.0 meters.

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?